Waterproof product



r eras LESTER KIRSCHBRAUN, 0F EVANSTON, ILLINOIS.

WATERPROOF FRQDUCT.

:Leiasea Specification of Letters Patent.

Patented May 330, i922.

Ro Drawing. Application filed February 1, 1919, Serial No. 274,499. Renewed October 28, 1921. Serial are. 511,100.

To all whom it may. concern:

Be it known that I, Lns'rnn KmsoHBRAUN, a citizen of the United States, residing in the city of Evanston, county .of Cook, and State of Illinois, have invented certain new and useful Improvements in Waterproof Products, of which the following is a specification;

This invention relates to the manufacture of waterproof products, and. refers more particularly to a waterproof product having a mottled ornamentation. Among the salient objects are to provide a product consisting essentially of a waterproof felt sheet in which the fibre and the waterproof binder are predetermined by different colors; to provide a product in which a sufficient amount of fibre is used and the sheet so formed as to cause the color of the fibre to predominate in certain mottled areas of the sheet; to provide a process in which the above effect is obtained partly by overloading the cylinder on the paper machine so as to cause a segregation of the binder in the formation on the cylinder, and, in general, to provide an improved product and process of the character referred to.

In making the waterproof sheet of the present invention, I make a non-adhesive emu sified matrix consisting of water, an emulsifying agent such as clay, and an adhesive binder having a predetermined color. .This binder may be the pitch resulting from the distillation of petroleum wax tailings colored with a suitable dye pigment of a predetermined color. Linseed oils, or other oils, with a combination of gums, may also.

be used. This emulsified matrix is so formed that the binderis in the internal phase and the water and emulsifying agent in the external phase, thus forming a non-adhesive emulsion. The binder is insulated against adhesion with any surface over which the mixture flows by means of water, which con-' stitutes the continuous phase of the emulsion.

The above matrix is then intimately mixed with fibre contained in water. The fibre is dyed a predetermined color different than the color of the matrix. This mixture is then fed through the flow box of a cylinder paper machine. This stock is built up on the cylinder to an excessive thickness, thus causing little ridges and hollows to form,

- so that the binder is not evenly distributed,

leaving portions of the fibre more or less.

exposed or relatively free from the binder. As the sheet passes over the machine, the binder is not evenly distributed relative to the fibre, resulting in certain spots being richer in binder than others. In the lean spots the color of the fibre predominates, while in the spots richer with the binder the color of the binder predominates. The result is a mottled effect in which one color gradually shades into the other. It is to be understood that this does not make an uneven sheet, but a smooth sheet is produced, having the mottled effect described. There is, of course, a certain amount of binder in the lean spots in the sheet, and the entire sheet is waterproof and nearly completely saturated, the mottled effect being more confined to the surface than into the body of the sheet. After the sheet is dried and the water removed, the binder unites with the fibre to form a unitary and strong sheet.

I claim as my invention:

1. A process of making a mottled waterproof sheet, consisting in making a colored emulsified bituminous matrix, mixing this matrix with a fibre of a different color than the matrix, forming this mixture into a sheet and causing an uneven surface distribution of the binder so that the color of the matrix and the binder respectively predominate in different areas of the surface of the sheet.

2. A process of. making a mottled waterproof sheet consisting in making a colored emulsified bituminous matrix, mixing this matrix with a fibre of different color than the matrix, forming this mixture into a felt-' ed sheet and causing little ridges and hollows to form over the surface of the sheet to produce thereby an uneven surface distribution of the binder so that the color of LESTER KIQRSCI-HBBAUN 

